18650 battery bank free charge protection module

I am showing here, how can you find a charge protection module for 18650 battery bank free. Make battery bank for mobile charging or use it for led emergency light. The lithium cells are most common and easily available in local market. Also you can remove them from any scrap or damaged laptop battery pack.

Development images

of 18650 battery bank free

Take any damaged 3.7 volts mobile battery. Remove its upper cover very carefully from the top where the power connections are visible. Use all safety precautions like hand gloves, goggles etc. Do it in open area outside the room or house. Don’t hit or cut the battery itself, only remove the top gently.

18650 Battery Bank Free Image1

Arrange 3 pieces of 18650 lithium batteries. You can easily find and remove from any laptop battery pack. Check its gravity voltage with multi tester. Also arrange 6 pieces of jackets/cell holders which is optional and fix them as shown in the following image. All cells should be in parallel.

18650 Battery Bank Free Image2

Solder all positive sides of 3 cells with piece of wire together and also solder all negative sides together as shown.

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Now connect the negative out of protection board to negative side of cells. And positive out of protection board to positive side of cells. Now take 2 piece of wires red & black and connect them to positive & negative-in of the protection board.

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Now take a power female socket and attach the 2 wires coming from the protection board to plus & minus side of power socket. Your battery bank is ready to charge with any 5 volts mobile charger.


Test the voltage before charging and keep supply on for charging. The protection board will stop charging automatically after full charge of batteries. Test it and use it. Solder two more wire in plus & minus sides of the cells for use which is not shown in the following image. Thanks for watching video and visiting the website.


List of components

  • 18650 lithium battery cell x 3
  • Cell holder jackets x 6
  • Charge protection module x 1
  • Power socket x 1
  • Connection wires
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